* doc/syntax/calling_methods.rdoc:  Added a Method Lookup section.
* doc/syntax/refinements.rdoc (Method Lookup):  Clarified that
  refinement methods are looked up in classes, not instances.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38928 b2dd03c8-39d4-4d8f-98ff-823fe69b080e